Servers typically use RAID arrays. My own little home file server has five 2TB hard drives setup as a RAID-6 array. This gives me 6TB of storage, with the ability to survive TWO simultaneous hard drive failures.
Code:root@storage:/# df -H Filesystem Size Used Avail Use% Mounted on /dev/sdg1 14G 2.4G 11G 19% / udev 4.2G 4.1k 4.2G 1% /dev tmpfs 4.2G 0 4.2G 0% /tmp tmpfs 827M 3.3M 823M 1% /run none 5.3M 0 5.3M 0% /run/lock none 4.2G 0 4.2G 0% /run/shm none 105M 0 105M 0% /run/user tmpfs 4.2G 0 4.2G 0% /var/tmp tmpfs 4.2G 0 4.2G 0% /var/crash /dev/md0 6.0T 1.4T 4.7T 23% /home/shared /dev/sdf1 2.0T 363G 1.7T 19% /home/shared/samba/external-2tb
If a drive fails, I simply replace it and the array re-builds in the background.
Statistically, the chances of me losing my server data because of MORE than 2 hard drives dying at once is almost zero.
Unless I get hit by lightening or fire an AK round through the server, my data is safe.
And, this server is only for movies and family data. I'm sure the IRS can afford something a bit better......
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